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Inside, officers found “supporting documentation” that he planned to commit the school shooting, Roberts said. She could not provide further details, including whether police recovered a weapon, saying the investigation was ongoing.

“The motive was possibly related to being bullied,” said Roberts, who added that the student had no prior juvenile records.

Marcus Walton, spokesman for West Contra Costa Unified School District, said the district was notified of the incident.

“The district handles these situations like it always does — very carefully with the safety of students and staff being of the utmost importance,” he said.